摘要
详细讨论了散乱点云数据采集、点云数据的预处理、点云三角化、采用NURBS为基础的曲面重构方法以及曲面光顺与精度检测等方面内容,为具有自由曲面特征的叶片类部件提供了曲面重构流程.针对基于散乱数据的轴流式水轮机叶片外形曲面重构问题,在阐述模型重构过程基本理论的基础上,根据曲面特征进行区域分块,提出了基于流线和轴面截线构造矩形域曲面片的方法,获得了符合设计要求的叶片实体模型.研究结果表明:该方法重构的数字化模型具有良好的光顺性和精确性,为后续作业奠定了基础,为逆向工程技术应用于流体机械行业提供了客观依据.
Some surface reconstruction related issues as Scattered point cloud data acquisition,data pretreatment,triangulation,NURBS-based surface reconstruction Methods,inspection of fairness and accuracy,ect,were discussed in detail.Then the process of surface reconstructing free-form surfaces of mechanical parts such as tubomachine blades was presented.For solving the problem of surface reconstruction of kaplan turbine blade contours based on scattered data,the basic theory of surface reconstruction was reviewed and a blade surface was divided into various regional blocks based on its feature in shape;then a method for constructing a surface patch in a rectangular domain whose four boundaries were two streamlines and two interaction curves between a blade and a meridian plane was proposed.As a result of those,a 3D model of blade that meets design requirements was yielded.The efforts show that the digital geomety model constructed by this method has good smoothness and accuracy.It proposed a foundation for the subsequent work and provides an objective basis for reverse engineering applied in fluid machinery industry.
出处
《排灌机械工程学报》
EI
北大核心
2012年第6期721-725,共5页
Journal of Drainage and Irrigation Machinery Engineering
基金
四川省教育厅成果转化培育项目(11ZZ002)
省部共建教育部重点实验室培育项目(SBZDPY-11-7)
关键词
轴流式水轮机叶片
散乱数据
流线和轴面截线
矩形域曲面片
曲面重构
kaplan turbine blade
scattered data
streamlines and axial cutting lines
rectangular patches
surface reconstruction
